Free NCIDQ IDFX Practice Test: 45 Questions
This free NCIDQ IDFX practice test has 45 original, unofficial questions across the six 2026-and-forward domains, with answers and explanations under each question. It is a focused sample, not a full-length exam or a prediction of passing.
Existing Conditions
Question 1
I. Existing Conditions · Initial code analysis: occupancy types · Multiple choice (4 options)
Under the 2021 IBC occupancy categories, which use is Group A-2? The banquet hall is a standalone assembly use with 100 occupants; no small-assembly or accessory-use exception applies.
Show answer and explanation
Answer: B. Banquet hall
Group A-2 covers assembly uses for eating and drinking, and ICC lists restaurants, taverns and bars, banquet halls and night clubs as examples. Classification comes first in a code analysis, because the occupancy group affects many later requirements, from egress to interior finishes.
- Why not A? An ordinary outpatient clinic without overnight care is Group B (business).
- Why not C? Retail stores are Group M (mercantile).
- Why not D? Banks are Group B (business).
Source: South Adams County Fire District, Occupancy Classifications; Assembly Group A-2 and Business Group B rows; Mercantile row
Question 2
I. Existing Conditions · Evaluate existing building conditions: field information · Multiple choice (4 options)
An old floor plan omits a fixed structural column documented in the current site survey. What should the designer do before developing the preliminary layout?
Show answer and explanation
Answer: A. Reconcile the plan with the survey and document the fixed column.
The documented column is an input to the layout, not an optional detail. Reconcile the records before relying on the drawing.
- Why not B? This postpones a known conflict until after layout decisions.
- Why not C? This assumes a removal option that has not been established.
- Why not D? This hides a fixed condition the design must address.
Source: WBDG, Architectural Programming; original calculation or decision from the facts in the question; Gather Relevant Information; original site-survey discrepancy
Question 3
I. Existing Conditions · Evaluate existing building conditions: construction types · Multiple choice (3 options)
An existing building has masonry exterior walls and wood-framed floors and interior walls. For this comparison, the wood structural elements are not covered by a permitted combustible-material exception. Which of the listed construction-type definitions is the best match?
Rule summary for this exercise
- 2021 IBC definitions, as reproduced in 2021 Seattle Building Code §§602.2–602.3: Types I and II generally use noncombustible building elements, with specified exceptions.
- Type III has noncombustible exterior walls and interior building elements of materials permitted by the code.
Show answer and explanation
Answer: B. Type III
Noncombustible exterior walls with the stated wood interior elements match the Type III description among these choices. A complete construction-type determination also requires the applicable fire-resistance ratings and other code conditions.
- Why not A? The stem excludes the exceptions that could permit the stated combustible structural elements in Type II.
- Why not C? The same noncombustible-element issue excludes Type I under the stated facts.
Source: 2021 Seattle Building Code, Chapter 6: Types of Construction; §602.2–602.3
Question 4
I. Existing Conditions · Evaluate existing building conditions: hazardous materials · Multiple choice (4 options)
A 1968 U.S. office floor will be renovated. The work removes ceilings and pipe insulation that may contain asbestos. What should the designer's existing-conditions report recommend?
Show answer and explanation
Answer: D. Flag the suspect materials and note that the owner or operator must have the affected areas thoroughly inspected for asbestos before the renovation begins.
Under the federal asbestos rule, the owner or operator of a demolition or renovation must thoroughly inspect the affected part of the facility for asbestos before the work starts. The report should flag the suspect conditions and the need for that inspection before disturbance; identifying a concern is not itself an asbestos inspection.
- Why not A? Encapsulating before anyone knows what the material is skips the required inspection.
- Why not B? Sampling during demolition disturbs the material before it's identified.
- Why not C? The rule expressly covers renovation as well as demolition.
Source: 40 CFR 61.145(a), asbestos inspection before demolition or renovation; §61.145(a)
Question 5
I. Existing Conditions · Site analysis: solar orientation · Multiple choice (3 options)
A drafting studio in the continental United States needs relatively even daylight with less glare and direct summer solar gain. Compare otherwise similar, unshaded windows. Which orientation best meets that aim?
Show answer and explanation
Answer: C. North
North-facing windows provide relatively even daylight with less direct sun and glare than comparable east- or west-facing windows. That is a relative design advantage, not a guarantee of zero summer heat gain.
- Why not A? East windows bring strong morning sun, glare and summer heat.
- Why not B? West windows bring low afternoon sun, glare and heat gain.
Source: U.S. Department of Energy, Energy 101: Daylighting; North-, east- and west-facing window paragraphs
Vignette A: Harbor Street office conversion
Questions 6–10 share one project. The questions cover Existing Conditions, Space Planning and Schematics.
Project facts
- A two-story building is being renovated. The entire second floor will house a professional services firm. For this exercise, apply the stated 2021 IBC egress rules; no existing-building or single-exit exception applies.
- Office area: 10,500 sq ft gross allocated to the business function, excluding the separate training room.
- Training room: 1,500 sq ft net, furnished with movable tables and chairs.
- The building is fully sprinklered (NFPA 13). It does not have an emergency voice/alarm communication system.
- The second floor's maximum overall diagonal is 150 ft.
- The office and training room are the only occupant-load components. No adjusted occupant load is approved. Exit separation is measured in a straight line; no rated-corridor measurement exception applies.
Rule summaries for this exercise. Use these rules for every question in this vignette.
- Occupant load factors: business areas, 150 sq ft gross per occupant; assembly without fixed seats, unconcentrated (tables and chairs), 15 sq ft net per occupant.
- Minimum exits or access to exits from a story under Table 1006.3.3, with single-exit exceptions excluded: 1–500 occupants, 2; 501–1,000 occupants, 3; more than 1,000 occupants, 4.
- For the stated non-H/non-I-2 uses, non-stair egress capacity is 0.2 inch per occupant. The reduced 0.15-inch factor requires both qualifying automatic sprinklers and an emergency voice/alarm communication system. Component minimum widths and exit distribution are separate checks.
- For the required pair of exits and the stated straight-line measurement, the ordinary separation is at least one-half of the maximum overall diagonal. The qualifying sprinklered-building exception permits one-third.
- For the stated training-room condition, Table 1006.2.1 permits no more than 49 occupants with one exit access doorway; the room in this exercise requires at least two.
These summaries state the conditions used in the questions, not every provision needed to approve a real project.
Question 6
Review Vignette A facts and rules
I. Existing Conditions · Initial code analysis: occupant load · Fill in the blank
Use Vignette A. What is the design occupant load of the second floor?
Show answer and explanation
Answer: 170 occupants.
Calculate each function with its own factor. Office: 10,500 ÷ 150 = 70. Training room: 1,500 ÷ 15 = 100. Total: 70 + 100 = 170.
Common mistake: 80 comes from dividing the combined 12,000 sq ft by 150, which applies the business factor to the training room. Before you divide, check whether each factor is gross or net and which function it belongs to.
Source: ICC, 2021 IBC Means of Egress; original calculation or decision from the facts in the question; Slide 19, Table 1004.5; slide 26, independent functions
Question 7
Review Vignette A facts and rules
VI. Schematics · Perform code review: life safety · Multiple choice (4 options)
Use Vignette A. How many exits must the second floor provide?
Show answer and explanation
Answer: C. 2
The floor's occupant load is 70 (office: 10,500 ÷ 150) plus 100 (training room: 1,500 ÷ 15), or 170. That falls in the 1–500 row, so the story needs 2 exits.
- Why not A? The vignette excludes the single-exit exceptions, so use the supplied story-exit table.
- Why not B? Three exits start at 501 occupants.
- Why not D? Four exits are required only above 1,000 occupants.
Source: ICC, 2021 IBC Means of Egress; original calculation or decision from the facts in the question; Slide 50, 2021 IBC Table 1006.3.3
Question 8
Review Vignette A facts and rules
VI. Schematics · Perform code review: life safety · Fill in the blank
Use Vignette A. Before checking each door's minimum clear width and the distribution among exits, what aggregate width does the occupant-load capacity calculation produce for the floor's exit doors?
Show answer and explanation
Answer: 34 inches.
170 occupants × 0.2 in per occupant = 34 in for the aggregate capacity calculation. The building is sprinklered, but it has no emergency voice/alarm system, so the reduced factor doesn't apply. This is not permission to install two 17-inch doors: each door must also meet its own minimum clear width, and the exit arrangement must meet the distribution requirements.
Common mistake: 25.5 comes from using 0.15 in per occupant. That factor needs sprinklers and a voice/alarm system together.
Source: ICC, 2021 IBC Means of Egress; original calculation or decision from the facts in the question; Slides 30–32, §1005 minimum width versus required capacity
Question 9
Review Vignette A facts and rules
IV. Space Planning · Complete space planning: life safety · Fill in the blank
Use Vignette A. Using straight-line exit separation, with no rated-corridor measurement exception, what is the minimum distance between the floor's two exits?
Show answer and explanation
Answer: 50 feet.
The building is fully sprinklered, so the one-third rule applies: 150 ft ÷ 3 = 50 ft. Exit separation shapes the plan early, so check it before the layout firms up.
Common mistake: 75 ft is the one-half rule, which applies when the building isn't fully sprinklered.
Source: ICC, 2021 IBC Means of Egress; original calculation or decision from the facts in the question; Slides 57–58, §1007.1.1
Question 10
Review Vignette A facts and rules
VI. Schematics · Perform code review: life safety · Multiple choice (4 options)
Use Vignette A. What is the minimum number of exit access doorways from the training room?
Show answer and explanation
Answer: A. Two
The training room's occupant load is 1,500 ÷ 15 = 100. That's more than 49, so the room needs at least two exit access doorways.
- Why not B? In this vignette, sprinklers allow the reduced separation distance. Without the voice/alarm system, they do not reduce the door-capacity factor, and they do not change this doorway count.
- Why not C? Nothing in the supplied rules requires three doorways for 100 occupants.
- Why not D? The rule depends on occupant load, not room area.
Source: ICC, 2021 IBC Means of Egress; original calculation or decision from the facts in the question; Slides 46–48, §1006.2.1 and Table 1006.2.1
Pre-Design
Question 11
II. Pre-Design · Establish best practices: universal design · Multiple choice (4 options)
A museum removes its stair-plus-separate-side-ramp entry and replaces it with one gently sloped entry walk that every visitor uses. Which principle of universal design does this change serve most directly?
Show answer and explanation
Answer: B. Equitable Use
Equitable Use calls for the same means of use where possible, or equivalent means where not, without segregating users. The change replaces a separate route with one shared entry.
- Why not A? Low Physical Effort concerns effort during use; the stated change is defined by ending the separate route.
- Why not C? Tolerance for Error is about reducing hazards from accidental actions.
- Why not D? Flexibility in Use is about accommodating different preferences and methods of use.
Source: NC State, Center for Universal Design; Principle 1
Question 12
II. Pre-Design · Establish best practices: universal design · Multiple choice (4 options)
A building's fire alarms use both horns and strobes, and its elevators announce floors out loud and display them on screen. Which principle of universal design does this illustrate?
Show answer and explanation
Answer: C. Perceptible Information
Perceptible Information means essential information reaches people regardless of their sensory abilities or the surroundings. Sending the same message through sight and sound is the classic example.
- Why not A? Simple and Intuitive Use is about being easy to understand regardless of experience or language.
- Why not B? Size and Space covers room to reach and use something.
- Why not D? Equitable Use concerns identical or equivalent means of use. Redundant sensory channels are the more specific fit.
Source: NC State, Center for Universal Design; Principle 4
Question 13
II. Pre-Design · Establish best practices: evidence-based design · Multiple choice (4 options)
Which statement best describes evidence-based design?
Show answer and explanation
Answer: D. Basing decisions about the built environment on credible research to achieve the best possible outcomes
That's the Center for Health Design's definition. The key words are credible research and outcomes. The research has to be relevant to the users and the result the project wants.
- Why not A? Code compliance is a minimum legal threshold, not a research method.
- Why not B? Past client choices are preferences, not evidence of outcomes.
- Why not C? Precedent study is a useful research method, but copying award winners doesn't show that a feature produces better outcomes.
Source: Center for Health Design, EBD Overview (hosted copy); p. 4, Center for Health Design definition
Question 14
II. Pre-Design · Establish best practices: sustainability and wellness · Multiple choice (4 options)
A client wants a certification framework built around the health and well-being of the people who use the building. Which is the best fit?
Show answer and explanation
Answer: A. WELL
The International WELL Building Institute positions WELL as an evidence-based framework for people-first places, centered on occupant health and well-being.
- Why not B? LEED is the U.S. Green Building Council's broader green-building framework. It includes health as well as environmental performance, but occupant health and well-being are the central framing of WELL.
- Why not C? ENERGY STAR addresses energy performance.
- Why not D? The ADA Standards are accessibility requirements, not a wellness certification.
Source: IWBI, WELL Certification; U.S. Green Building Council, LEED; ENERGY STAR, About; U.S. Access Board, Guide to the ADA Standards: Signs; Program introductions; Access Board guide identifies ADA Standards as accessibility requirements
Question 15
II. Pre-Design · Establish best practices: signage and wayfinding · Multiple choice (4 options)
Under the 2010 ADA Standards §703.5.1, how should the visual characters and background on a permanent room identification sign be finished?
Show answer and explanation
Answer: C. With a non-glare finish and characters that contrast with their background, light on dark or dark on light
Glare and low contrast both make signs hard to read. Visual characters and their background need a non-glare finish and either light-on-dark or dark-on-light contrast.
- Why not A? Gloss creates the glare the requirement is meant to prevent.
- Why not B? Braille and tactile characters don't replace the visual requirements; both apply.
- Why not D? Color alone doesn't communicate to everyone, and room signs need characters.
Source: U.S. Access Board, Guide to the ADA Standards: Signs; 2010 ADA Standards §703.5.1, Finish and Contrast
Question 16
II. Pre-Design · Establish best practices: signage and wayfinding · Multiple choice (4 options)
Under the 2010 ADA Standards §703.4, where should a tactile permanent-room identification sign go at a single door? Wall space is available on the latch side, and no door-mounted-sign exception applies.
Show answer and explanation
Answer: B. On the latch side, with the baselines of the tactile characters between 48 in and 60 in above the floor
Place the sign beside the door on the latch side. The lowest tactile-character baseline must be at least 48 in above the floor and the highest no more than 60 in. The separate 18 in × 18 in reading space must also be beyond the door swing through 45 degrees; latch-side placement alone does not establish that clearance.
- Why not A? The door-mounted exception is excluded, and an unspecified eye level does not establish the required baseline heights.
- Why not C? Wrong side and too high.
- Why not D? The height range is part of the requirement.
Source: U.S. Access Board, Guide to the ADA Standards: Signs; 2010 ADA Standards §703.4, Installation Height and Location; Location at Doors
Question 17
II. Pre-Design · Establish best practices: universal design · Multiple choice (4 options)
A power-assisted door stops and reverses when it touches a person in its path. Which principle of universal design does the stop-and-reverse feature illustrate?
Show answer and explanation
Answer: D. Tolerance for Error
Tolerance for Error means minimizing hazards and the consequences of accidental or unintended actions. Reversing on contact is a protective response intended to reduce harm from a mistimed approach.
- Why not A? The power assist itself serves Low Physical Effort, but the question asks about the stop-and-reverse feature.
- Why not B? Nothing here communicates information.
- Why not C? The feature isn't about giving all users the same means of use.
Source: NC State, Center for Universal Design; Principles 5 and 6
Programming
Question 18
III. Programming · Create programmatic diagrams · Multiple choice (4 options)
What does an adjacency matrix record?
Show answer and explanation
Answer: B. How strongly each pair of spaces needs to be near each other
An adjacency matrix is a relationship table that rates every pair of spaces, often as required, desired or not needed. Designers use it to build bubble diagrams, where line weights can show how strong each relationship is.
- Why not A? Assigning departments to floors is a stacking diagram.
- Why not C? Furniture layouts come later, in space planning.
- Why not D? The structural grid is an existing condition, not a programming output.
Source: Vectorworks 2024 Help, Programming Studies; WBDG, Architectural Programming; Programming Studies: adjacency matrix and bubble diagram; Architectural Programming: Identify Strategies
Question 19
III. Programming · Determine user needs: sensory considerations · Matching (text alternative to drag and place)
Match each term to what it measures. Use each description once.
| Item | Match to one response |
|---|---|
| 1. STC (Sound Transmission Class) | ___ |
| 2. NRC (Noise Reduction Coefficient) | ___ |
| 3. CRI (Color Rendering Index) | ___ |
| 4. Color temperature (kelvins) | ___ |
Response bank
- A. How much sound a material absorbs
- B. Color-rendering fidelity compared with a reference at the same correlated color temperature
- C. Whether light looks warm or cool
- D. How much sound a wall or floor-ceiling assembly blocks between rooms
Show answer and explanation
Answer: 1 → D; 2 → A; 3 → B; 4 → C.
| Item | Correct match |
|---|---|
| STC (Sound Transmission Class) | How much sound a wall or floor-ceiling assembly blocks between rooms |
| NRC (Noise Reduction Coefficient) | How much sound a material absorbs |
| CRI (Color Rendering Index) | Color-rendering fidelity compared with a reference at the same correlated color temperature |
| Color temperature (kelvins) | Whether light looks warm or cool |
Keep the two pairs separate. STC is about isolation (sound passing through an assembly); NRC is about absorption (sound reflecting inside a room). CRI compares color rendering with a reference at the same correlated color temperature; kelvins describe how warm or cool the light looks. A lamp can be warm and render color poorly, or cool and render it well.
Common mistake: For the sound terms, picture an isolating assembly (STC) versus an absorptive finish (NRC). For the lighting terms, CRI uses a reference at the same correlated color temperature: 100 indicates matching reference color fidelity, and negative values are possible. Color temperature is a kelvin value such as 2700 K.
Source: NIH, Sound Design Metrics; U.S. Department of Energy, LED Color Characteristics; Sound Design Metrics p. 1, STC/NRC; LED Color Characteristics p. 6, Color Rendering Index
Question 20
III. Programming · Validate project program: gross building components · Fill in the blank
A program requires 4,200 sq ft of net assignable area. For this estimate, building efficiency is defined as net assignable area divided by total gross area, and the target efficiency is 75%. What total gross area should the designer allow?
Show answer and explanation
Answer: 5600 sq ft.
Efficiency = net ÷ gross, so gross = net ÷ efficiency = 4,200 ÷ 0.75 = 5,600 sq ft. The 75% is a project input for this exercise, not a universal allowance.
Common mistake: 5,250 comes from adding 25% of the net area. The non-assignable share is 25% of the gross area, so you divide by 0.75 instead.
Source: WBDG, Architectural Programming; original calculation or decision from the facts in the question; Determine Quantitative Requirements: net assignable / gross area efficiency
Question 21
III. Programming · Determine user needs: acoustics · Multiple choice (4 options)
Counseling rooms need speech privacy from the busy waiting area next to them. Which partition attribute matters most?
Show answer and explanation
Answer: A. A higher STC for the wall assembly
STC rates airborne sound isolation through a wall or floor-ceiling assembly, making it the relevant partition attribute here. The rating is one part of a complete speech-privacy design, not a guarantee by itself.
- Why not B? Flame spread is a fire property, not an acoustic one.
- Why not C? NRC measures absorption. Absorptive panels reduce reflected sound inside a room; NRC alone does not rate the partition's isolation between rooms.
- Why not D? Lighting quality doesn't affect speech privacy.
Source: NIH, Sound Design Metrics; STC vs. NRC
Question 22
III. Programming · Determine user needs: lighting · Multiple choice (4 options)
A staff lounge should feel warm and residential. Which lamp color temperature fits best?
Show answer and explanation
Answer: A. 2700–3000 K
Lower kelvin values in these choices look warmer. The Department of Energy lists 2700 K as warm and 3000 K as soft/warm, which matches the requested appearance.
- Why not B? 5000 K is in the cool range.
- Why not C? 6500 K is cooler still.
- Why not D? Color temperature is exactly what changes the warm-or-cool appearance of light.
Source: U.S. Department of Energy, Light-bulb color-temperature table; Table 3: Correlated Color Temperatures and Typical Applications
Question 23
III. Programming · Determine user needs: ergonomics and human factors · Multiple choice (4 options)
Which monitor placement follows OSHA's computer workstation guidance?
Show answer and explanation
Answer: D. Top of the screen at or slightly below eye level, about 20–40 in from the eyes
OSHA recommends that the top of the monitor sit at or slightly below eye level, with a preferred viewing distance of about 20–40 in. Adjust for readable text, a neutral head position and individual needs; bifocal users may need a lower screen. These are workstation recommendations, not a promise of symptom prevention.
- Why not A? 12 in is closer than the preferred range; centering the screen at eye level also places its top above the recommended position.
- Why not B? A screen above eye level can encourage a backward head tilt.
- Why not C? An adjustable chair does not make every possible monitor position suitable.
Source: OSHA, Computer Workstations: Monitors; Monitors: height and viewing distance
Question 24
III. Programming · Determine user needs: acoustics and universal design · Fill in the blank
A rectangular classroom will meet the enhanced classroom acoustics provisions in 2017 ICC A117.1 §808. It measures 35 ft × 30 ft with a uniform 10 ft ceiling. What maximum reverberation time applies at the specified 500, 1000 and 2000 Hz octave bands?
Rule summary for this exercise
- For the enhanced-acoustics classroom condition in this exercise: volume of 10,000 cu ft or less, maximum reverberation time 0.6 seconds; volume over 10,000 cu ft up to 20,000 cu ft, maximum 0.7 seconds. These limits apply at the 500, 1000 and 2000 Hz octave bands.
Show answer and explanation
Answer: 0.7 seconds.
Find the volume first: 35 × 30 × 10 = 10,500 cu ft. That's over 10,000, so the 0.7-second limit applies.
Common mistake: 0.6 comes from comparing the floor area (1,050 sq ft) to a volume threshold. Check the units the rule uses.
Source: ICC, 2017 ICC A117.1 Significant Changes; original calculation or decision from the facts in the question; Slide 55, 2017 ICC A117.1 §808 enhanced classroom acoustics
Space Planning
Question 25
IV. Space Planning · Complete space planning: universal design · Area selection (text alternative to hot spot)
A new public building is designed under ICC A117.1-2017, which requires a 67 in diameter circular turning space in new construction. No knee or toe clearance overlap, T-shaped alternative or special exception applies. Which unobstructed rectangular area can contain the turning circle?
Show answer and explanation
Answer: C. Area C: 68 in × 68 in
A 67 in circle needs at least 67 in in both directions. Area C gives 68 in each way. The 2017 edition raised the circle from 60 in to 67 in for new construction, so plans built on the old 60 in habit fail.
- Why not A? 60 in is the existing-building circle, and it's too narrow here.
- Why not B? 66 in is one inch short.
- Why not D? 64 in is too short in one direction, even though 80 in is plenty in the other.
Source: ICC, 2017 ICC A117.1 Significant Changes; original calculation or decision from the facts in the question; Slide 13, §304 new-building circular turning space; original rectangle dimensions
Question 26
IV. Space Planning · Complete space planning: human factors · Fill in the blank
Under the 2010 ADA Standards §308.2.2, a control requires a forward reach over a 24 in deep counter. The clear floor space and knee/toe clearance extend the full reach depth. What is the highest operable part height above the finished floor?
Rule summary for this exercise
- Forward reach over an obstruction: where the reach depth is 20 in or less, the high reach is 48 in maximum; where the reach depth is greater than 20 in, up to 25 in, the high reach is 44 in maximum.
Show answer and explanation
Answer: 44 inches.
A 24 in forward-reach depth falls in the over-20-to-25 in band, so the limit is 44 in above the finished floor. This is the forward-reach condition, not the different side-reach provision.
Common mistake: 48 in is the limit for reach depths of 20 in or less.
Source: U.S. Access Board, Guide to the ADA Standards: Operable Parts; 2010 ADA Standards §308.2.2, Obstructed High Reach; Knee and Toe Space
Question 27
IV. Space Planning · Complete space planning: circulation · Fill in the blank
A corridor has an actual clear width of 44 in, which is also its required width. Under the 2021 IBC rule below, a door swings into the corridor; no door-encroachment exception applies. When fully open, it projects the maximum permitted amount. How much clear corridor width remains at the open door?
Rule summary for this exercise
- A door in the fully open position shall not reduce the required width by more than 7 in. A door in any position shall not reduce the required width by more than one-half.
Show answer and explanation
Answer: 37 inches.
44 − 7 = 37 in. Door swings into corridors are a common space-planning conflict, so check the fully open position on the plan.
Common mistake: 22 in comes from the one-half limit. The fully open door must also satisfy the stricter 7 in encroachment limit; the one-half rule does not replace it.
Source: ICC, 2021 IBC Means of Egress; original calculation or decision from the facts in the question; Slides 88–90, §1005.7 door encroachment
Question 28
IV. Space Planning · Create initial drawings: preliminary lighting layouts · Fill in the blank
Under the 2021 IBC §1008.2.1, what minimum illumination is required at the walking surface of an occupied, level exit-access corridor under normal power? No special occupancy exception applies. Answer in footcandles.
Show answer and explanation
Answer: 1 footcandles.
The level corridor needs at least 1 footcandle at the walking surface under the stated condition. Stairways and their required landings have a different normal-power requirement. Egress lighting belongs on the preliminary reflected ceiling plan, not as an afterthought.
Common mistake: Numbers such as 5 or 10 come from other provisions, such as externally illuminated exit signs or exit stairways.
Source: ICC, 2021 IBC Means of Egress; Slides 79–81, §1008.2 illumination, stairways and exceptions
Question 29
IV. Space Planning · Complete space planning: daylight and views · Multiple choice (4 options)
An office in the continental United States has unshaded west-facing windows. Considering afternoon screen glare, which space is least suited to that wall? The storage is for non-light-sensitive supplies; the closet and copy room have no screen-based task.
Show answer and explanation
Answer: D. Video-conference room used mostly in the afternoon
West-facing windows bring low afternoon sun, glare and summer heat gain. A screen-based room used in the afternoon takes the full brunt.
- Why not A? Storage doesn't depend on daylight or screens.
- Why not B? A coat closet is barely occupied.
- Why not C? A copy room is used briefly and isn't screen-critical.
Source: U.S. Department of Energy, Energy 101: Daylighting; window orientation guidance
Question 30
IV. Space Planning · Complete space planning: life safety and universal design · Multiple choice (4 options)
Under the 2010 ADA Standards §307.4, a lobby circulation path passes beneath an open stair where headroom drops below 80 in. What is required at the low-headroom zone?
Show answer and explanation
Answer: A. A barrier with its leading edge no higher than 27 in, where headroom is under 80 in
People using a long cane detect objects at or below 27 in. A barrier at that height keeps them out of the low-headroom zone before they can strike their heads.
- Why not B? A carpet change isn't a barrier a cane will detect.
- Why not C? A sign overhead doesn't stop anyone from walking into the stair.
- Why not D? Circulation paths include lobbies, not only corridors.
Source: U.S. Access Board, Guide to the ADA Standards: Protruding Objects; 2010 ADA Standards §307.4 Vertical Clearance
Vignette B: Clinic corridor review
Questions 31–35 share one project. The questions cover Space Planning and Preliminary FF&E and Finishes.
Project facts
- A one-story outpatient clinic (Group B), fully sprinklered with an NFPA 13 system. More than one exit or exit access doorway is required. Apply the stated 2021 IBC corridor rules and the separately identified 2010 ADA protrusion rule.
- The main corridor has three dead-end segments, each 6 ft wide: Zone 1 is 18 ft long, Zone 2 is 42 ft long and Zone 3 is 62 ft long. No other exception applies.
- A fire extinguisher cabinet is surface-mounted in the corridor. Its leading edge is 40 in above the floor, and it projects 5 in from the wall.
- Finish schedule: corridor vinyl wallcovering tested to ASTM E84 with a flame spread index of 60 and a smoke-developed index of 300; waiting-room carpet tile with a critical radiant flux of 0.30 W/cm²; waiting-room window drapery.
Rule summaries for this exercise. Use these rules for every question in this vignette.
- 2021 IBC §1020.5: where more than one exit or exit access doorway is required, the base dead-end limit is 20 ft. The qualifying NFPA 13-sprinklered Group B exception permits 50 ft. The separate exception for a dead end shorter than 2.5 times its least width does not apply to these 6-ft-wide segments.
- 2010 ADA Standards §307.2: a wall-mounted object with a leading edge at the stated 40 in height may project no more than 4 in into the circulation path.
- Wall and ceiling finish classes (ASTM E84 flame spread index; smoke-developed index 450 or less for every class): Class A 0–25; Class B 26–75; Class C 76–200.
- Floor finish classes by critical radiant flux: Class I requires at least 0.45 W/cm²; Class II requires at least 0.22 W/cm². Use the highest class the stated result achieves.
These summaries state the conditions used in the questions, not every provision needed to approve a real project.
Question 31
Review Vignette B facts and rules
IV. Space Planning · Complete space planning: circulation and life safety · Area selection (text alternative to hot spot)
Use Vignette B. Select the dead-end segment that exceeds the applicable length limit.
Show answer and explanation
Answer: C. Zone 3 (62 ft)
The clinic is Group B and fully sprinklered with NFPA 13, so dead ends may run up to 50 ft. Zone 3 at 62 ft is too long; Zones 1 and 2 comply.
- Why not A? 18 ft complies even with the base 20 ft limit.
- Why not B? Choosing Zone 2 means you applied the 20 ft base limit and missed the sprinklered Group B exception.
Source: ICC, 2021 IBC Means of Egress; Slides 70–72, 2021 IBC §1020.5 including the length-to-width exception
Question 32
Review Vignette B facts and rules
IV. Space Planning · Complete space planning: universal design · Multiple choice (4 options)
Use Vignette B. What is the best correction for the fire extinguisher cabinet?
Show answer and explanation
Answer: D. Specify a recessed or semi-recessed cabinet that projects 4 in or less
The cabinet's leading edge is at 40 in, inside the restricted height range, so it may project only 4 in into the circulation path. Specifying a recessed or semi-recessed cabinet with a projection of 4 in or less corrects this protrusion; other installation and route requirements still apply.
- Why not A? Sprinklers are a fire protection measure; they don't change accessibility rules for protruding objects.
- Why not B? 30 in is still inside the 27–80 in zone, so the 4 in limit still applies.
- Why not C? A floor strip doesn't reduce the projection.
Source: U.S. Access Board, Guide to the ADA Standards: Protruding Objects; 2010 ADA Standards §307.2, Protrusion Limits
Question 33
Review Vignette B facts and rules
V. Preliminary FF&E and Finishes · Identify finish materials: reference standards · Matching (text alternative to drag and place)
Use Vignette B. Match each product to the corresponding listed test purpose. This identifies the tests, not whether a particular product is permitted in the clinic.
| Item | Match to one response |
|---|---|
| 1. Corridor vinyl wallcovering | ___ |
| 2. Waiting-room carpet tile | ___ |
| 3. Waiting-room drapery | ___ |
Response bank
- A. Critical radiant flux test (NFPA 253 / ASTM E648)
- B. NFPA 701 flame propagation test
- C. ASTM E84 tunnel test (flame spread and smoke-developed indexes)
Show answer and explanation
Answer: 1 → C; 2 → A; 3 → B.
| Item | Correct match |
|---|---|
| Corridor vinyl wallcovering | ASTM E84 tunnel test (flame spread and smoke-developed indexes) |
| Waiting-room carpet tile | Critical radiant flux test (NFPA 253 / ASTM E648) |
| Waiting-room drapery | NFPA 701 flame propagation test |
Know what each test measures. ASTM E84 rates how flame spreads across wall and ceiling surfaces. The radiant flux test finds the minimum radiant heat a floor covering needs to keep a flame spreading across it, so a higher number means better performance. NFPA 701 tests flame propagation of textiles such as drapery used as decorative materials.
Common mistake: Do not interchange a surface-burning test, a floor-covering radiant-flux test and a decorative-textile flame-propagation test. The required test and installation conditions must match the intended product use.
Source: Intertek, ASTM E84: Surface Burning Characteristics; Intertek, ASTM E648: Critical Radiant Flux; Capital Testing, Flame Spread Testing Requirements for Flooring Products; NFPA 701, scope published through ANSI; E84 and E648 test purposes; flooring Class I/II discussion; NFPA 701 published scope
Question 34
Review Vignette B facts and rules
V. Preliminary FF&E and Finishes · Identify finish materials · Multiple choice (3 options)
Use Vignette B. What is the classification of the corridor wallcovering?
Show answer and explanation
Answer: B. Class B
A flame spread index of 60 falls in the 26–75 range, and the smoke-developed index of 300 is within the 450 limit. Whether Class B is permitted in this corridor is a separate question, answered by the occupancy table.
- Why not A? Class A requires a flame spread index of 25 or less.
- Why not C? Class C starts at 76.
Source: Intertek, ASTM E84: Surface Burning Characteristics; Flame-spread classifications: Class B FSI 26–75 and SDI no more than 450
Question 35
Review Vignette B facts and rules
V. Preliminary FF&E and Finishes · Identify finish materials · Multiple choice (3 options)
Use Vignette B. What is the classification of the waiting-room carpet tile?
Show answer and explanation
Answer: B. Class II
0.30 W/cm² is at least 0.22, so it meets Class II, but it's below the 0.45 needed for Class I. For this test a higher number means better performance.
- Why not A? Class I requires 0.45 W/cm² or more.
- Why not C? It would fail both classes only below 0.22 W/cm².
Source: Capital Testing, Flame Spread Testing Requirements for Flooring Products; Critical radiant flux classifications: Class I at least 0.45; Class II at least 0.22 W/cm²
Preliminary FF&E and Finishes
Question 36
V. Preliminary FF&E and Finishes · Identify significant FF&E: construction (millwork) vs. FF&E · Multiple choice (4 options)
The project scope assigns custom built-in wood casework to construction millwork, and freestanding tables, chairs and rugs to the FF&E package. Which item belongs in the construction millwork documents?
Show answer and explanation
Answer: B. A custom built-in wood reception desk anchored to the wall, with integrated power
The project scope expressly assigns the custom built-in wood desk to construction millwork. The freestanding furniture and rug belong to its FF&E package. Scope divisions depend on the contract; being fixed or wired is not a universal classification rule.
- Why not A? Freestanding tables are furniture.
- Why not C? Task chairs are furniture.
- Why not D? Rugs are furnishings.
Source: original calculation or decision from the facts in the question; Explicit project-scope allocation in the stem
Question 37
V. Preliminary FF&E and Finishes · Identify finish materials: budgets and quantities · Fill in the blank
A floor finish covers 550 sq ft. The project adds a 10% allowance for waste and attic stock, and each carton covers 24 sq ft. Cartons are sold whole. What is the minimum number of cartons to order?
Show answer and explanation
Answer: 26 cartons.
Add the allowance first: 550 × 1.10 = 605 sq ft. Then divide: 605 ÷ 24 ≈ 25.21 cartons. Round up to 26, because you can't buy part of a carton.
Common mistake: 25 rounds down and leaves you short. 23 skips the allowance (550 ÷ 24 ≈ 22.92, rounded up).
Source: original calculation or decision from the facts in the question
Question 38
V. Preliminary FF&E and Finishes · Identify finish materials: sustainability · Multiple choice (4 options)
Which finish-selection step does the most to reduce occupants' exposure to volatile organic compounds (VOCs)?
Show answer and explanation
Answer: B. Selecting low-emitting finishes and adhesives, and planning ventilation during and after installation
The EPA lists building materials, furnishings, glues and adhesives among indoor VOC sources, and points to source control and ventilation as ways to reduce exposure. Its account of the TEAM study, published in 1985, reports roughly a dozen common organic pollutants at levels 2 to 5 times higher inside the studied homes than outside. That finding is not a fixed ratio for every building.
- Why not A? NRC is about sound absorption.
- Why not C? Class A is a surface-burning classification, not a VOC-emissions measure.
- Why not D? CRI is about color rendering.
Source: EPA, Volatile Organic Compounds and Indoor Air Quality; sources and reducing exposure
Question 39
V. Preliminary FF&E and Finishes · Identify finish materials: acoustics · Multiple choice (4 options)
An open office feels loud and echoey. The candidate ceiling tiles satisfy the required fire and other project criteria. To reduce reflected sound within the room, which attribute should the designer prioritize?
Show answer and explanation
Answer: A. A higher NRC
Echo inside a room is a reflection problem, and absorption reduces reflected sound. NRC measures how much sound a material absorbs.
- Why not B? Class A is a fire classification.
- Why not C? STC rates how well an assembly blocks sound between rooms.
- Why not D? Color temperature describes light.
Source: NIH, Sound Design Metrics; STC vs. NRC
Schematics
Question 40
VI. Schematics · Perform code review: code navigation · Multiple choice (4 options)
In the exam's code document, where would you look up the maximum length of a dead-end corridor?
Show answer and explanation
Answer: D. IBC Chapter 10, Means of Egress
Corridors are Section 1020, inside Chapter 10, Means of Egress. On test day the code text comes with the question, so knowing which chapter answers which question saves real time.
- Why not A? Chapter 8 covers finish classifications.
- Why not B? Chapter 11 scopes accessibility requirements.
- Why not C? A117.1 Chapter 4 covers accessible route elements, not egress limits.
Source: CIDQ, Building Codes reference list; IBC Chapter 10 list
Question 41
VI. Schematics · Perform code review: universal design · Multiple choice (4 options)
Where are the technical requirements for grab bars?
Show answer and explanation
Answer: B. ICC A117.1 Chapter 6, Section 609 Grab Bars
ICC A117.1 Chapter 6 covers plumbing elements and facilities, and Section 609 sets the grab bar criteria. IBC and IPC sections decide where accessible facilities are needed; A117.1 tells you how to build them.
- Why not A? Chapter 12 covers interior environment items such as toilet and bathroom requirements, not grab bar specifications.
- Why not C? IPC Chapter 4 covers fixture counts and installation.
- Why not D? Chapter 10 is egress.
Source: CIDQ, Building Codes reference list; A117.1 Chapter 6
Question 42
VI. Schematics · Perform code review: life safety · Multiple choice (4 options)
Under the 2021 IBC §1013.1, an exit sign is required in an exit-access corridor and is listed for a 100 ft viewing distance. No exception applies. What is the maximum permitted distance from any point in the corridor to the nearest visible exit sign?
Show answer and explanation
Answer: C. 100 ft
Use the smaller of 100 ft and the sign's listed viewing distance. Both are 100 ft here, so the answer is 100 ft. A sign listed for a shorter viewing distance would require that shorter limit.
- Why not A? 50 ft is below the maximum established by this sign listing and rule.
- Why not B? 75 ft is also below the maximum established here.
- Why not D? 150 ft exceeds the code cap and the stated sign listing.
Source: ICC, 2021 IBC Means of Egress; Slide 74, 2021 IBC §1013.1: 100 ft or listed viewing distance, whichever is less
Question 43
VI. Schematics · Visualize design: drawing scale · Multiple choice (4 options)
On a floor plan drawn at 1/4 in = 1 ft-0 in, a wall measures 4 in on the printed sheet. What length does it represent?
Show answer and explanation
Answer: C. 16 ft
At this scale, each 1/4 in on the sheet equals 1 ft. 4 in ÷ 0.25 in = 16 quarter-inches, so 16 ft.
- Why not A? 1 ft comes from multiplying 4 × 0.25.
- Why not B? 8 ft is the answer at 1/2 in = 1 ft-0 in.
- Why not D? 48 ft comes from multiplying 4 × 12 instead of dividing by 0.25.
Source: original calculation or decision from the facts in the question
Question 44
VI. Schematics · Perform code review: life safety · Fill in the blank
Under the supplied 2021 IBC rules, one story contains 72,000 sq ft gross allocated to business use, excluding a separate 2,400 sq ft net assembly room with tables and chairs. These are the only occupant-load components, and no single-exit or adjusted-load exception applies. What is the minimum number of exits from the story?
Rule summary for this exercise
- Occupant load factors: business areas, 150 sq ft gross; assembly, unconcentrated (tables and chairs), 15 sq ft net.
- Minimum exits from a story: 1–500 occupants, 2; 501–1,000 occupants, 3; more than 1,000 occupants, 4.
Show answer and explanation
Answer: 3 exits.
Business: 72,000 ÷ 150 = 480. Assembly: 2,400 ÷ 15 = 160. Total: 640, which falls in the 501–1,000 row, so 3 exits.
Common mistake: 2 comes from counting only the business area (480). Add every space on the story before you read the table.
Source: ICC, 2021 IBC Means of Egress; original calculation or decision from the facts in the question; Slide 19, Table 1004.5; slide 50, Table 1006.3.3
Question 45
VI. Schematics · Perform code review: universal design · Multiple choice (4 options)
IBC Section 1112 tells you where accessible signs are required. Where do you find how a tactile room sign must be made and mounted?
Show answer and explanation
Answer: A. ICC A117.1 Chapter 7, Section 703 Signs
IBC scoping sections say where a feature is required; ICC A117.1 gives the technical criteria for building it. Both sections appear in CIDQ's code document.
- Why not B? Section 1013 covers egress exit signs, including tactile exit signage; it is not the general technical specification for a room identification sign.
- Why not C? Section 1112 scopes signs; it doesn't contain all the technical criteria.
- Why not D? IPC Chapter 4 covers plumbing fixtures.
Source: CIDQ, Building Codes reference list; IBC 1112; A117.1 Chapter 7
Your tally on this page
The interactive tally and its buttons start once the page has fully loaded. You can always count by hand with the score table below.
0 correct / 45 · 0.0% of the full set
- Correct
- 0
- Incorrect
- 0
- Attempted
- 0
- Unanswered
- 45
- Answer viewed
- 0
- Unscored
- 45
- Flagged
- 0
Attempted = correct + incorrect. Unscored = unanswered + answer viewed. The percentage always uses all 45 questions.
| Domain | Questions | Correct | Incorrect | Answer viewed | Unanswered |
|---|---|---|---|---|---|
| I. Existing Conditions | 1, 2, 3, 4, 5 and 6 | 0 / 6 | 0 | 0 | 6 |
| II. Pre-Design | 11, 12, 13, 14, 15, 16 and 17 | 0 / 7 | 0 | 0 | 7 |
| III. Programming | 18, 19, 20, 21, 22, 23 and 24 | 0 / 7 | 0 | 0 | 7 |
| IV. Space Planning | 9, 25, 26, 27, 28, 29, 30, 31 and 32 | 0 / 9 | 0 | 0 | 9 |
| V. Preliminary FF&E and Finishes | 33, 34, 35, 36, 37, 38 and 39 | 0 / 7 | 0 | 0 | 7 |
| VI. Schematics | 7, 8, 10, 40, 41, 42, 43, 44 and 45 | 0 / 9 | 0 | 0 | 9 |
Feedback on these 45 practice questions only. It isn't an NCIDQ scaled score, and it doesn't rate readiness or predict a result.
Score your practice set
Count your correct first answers in each domain. A matching question counts as correct only if every match is right. Leave an item unscored if you viewed its answer before responding; do not turn a later correction into a first-attempt point.
| IDFX domain | CIDQ weight | Questions in this set | Your correct |
|---|---|---|---|
| I. Existing Conditions | 14% | 1–6 (6) | ___ / 6 |
| II. Pre-Design | 15% | 11–17 (7) | ___ / 7 |
| III. Programming | 16% | 18–24 (7) | ___ / 7 |
| IV. Space Planning | 19% | 9, 25–32 (9) | ___ / 9 |
| V. Preliminary FF&E and Finishes | 16% | 33–39 (7) | ___ / 7 |
| VI. Schematics | 20% | 7, 8, 10, 40–45 (9) | ___ / 9 |
| Total | 100% | 45 | ___ / 45 |
Full-set practice percentage = correct ÷ 45 × 100. Also record attempted, incorrect and unscored items; do not silently change the denominator to the number attempted. For example, 12 correct and 3 incorrect means 15 attempted, 30 unscored and 12/45 = 26.7% for the full set.
Weights are from CIDQ's IDFX blueprint. We sized each domain's share of this set to roughly match them.
Your total describes how you did on these 45 questions. It isn't an NCIDQ score and doesn't predict one. CIDQ reports a scaled score from 200 to 800, with 500 to pass, and it equates scores across exam forms (CIDQ, Exam Scoring Overview). Six to nine questions per domain cannot establish precise domain readiness, so treat a miss as a lead to follow, not a verdict.
What to do with a missed question
The useful part of a miss is the reason behind it. Name it, then act on it:
| What went wrong | What to do next |
|---|---|
| Missed a project fact or condition | Underline the fact that rules out your answer, then compare the options again |
| Used the wrong rule, edition or exception | Find the rule in the supplied summary or source and say out loud which condition triggers it (sprinklered, new building, Group B) |
| Used the wrong base or rounding in a calculation | Write the formula with units before you put in numbers, and decide which way to round before you calculate |
| Confused two similar terms (STC and NRC, gross and net) | Write a one-line definition of each and one example where only one applies |
| Got it right but couldn't explain why | Explain why the strongest wrong answer fails before moving on |
If you retake the set, expect a higher score from remembering answers. A better test of what you learned is a new question on the same rule, such as the official CIDQ questions linked below.
How this practice set compares with the real IDFX
| Row label | This practice set | The real IDFX |
|---|---|---|
| Questions | 45 original questions | 115 questions, including 15 unscored pretest questions you can't identify |
| Time | Untimed; an optional pacing exercise is explained below | 3 hours of testing time; the appointment includes 30 additional minutes for check-in, the confidentiality agreement, tutorial and survey |
| Question types | Multiple choice (3 and 4 options), fill in the blank, matching, area selection | Multiple choice (3 and 4 options), drag and place, fill in the blank, hot spot |
| Shared scenarios | Two vignettes of 5 questions | Vignettes with 3–5 questions each |
| Codes | Selected rule summaries and source links; each dimensional exercise names its standard and conditions | A code document provided as part of each question: text only, no images |
| Calculator | Your own | On-screen calculator only, unless a handheld is approved as an accommodation |
| Results | Your count of correct answers | Scaled score, 200–800; 500 passes |
Sources: CIDQ IDFX blueprint; NCIDQ Candidate Handbook (exam structure, calculators); CIDQ blueprint FAQs (vignettes); CIDQ Building Codes document.
What this set can't copy: CIDQ's real question pool, its scaling and its exact screen layout. Matching and area-selection questions here are text alternatives, not replicas of the exam controls. CIDQ's Study Materials page links its official Demo Exam for interface familiarization.
For an optional pacing exercise, 45 × 180 ÷ 115 ≈ 70.4 minutes. That uses only the official time and question count; it does not establish equivalent difficulty or an official pace for this different item mix.
Questions 15, 16, 26, 30 and 32 explicitly use the 2010 ADA Standards as supplemental accessibility practice. Questions 24 and 25 use 2017 ICC A117.1. Do not transfer a dimension or exception from one standard to another without checking the specified source.
Using the code document on test day
From the April 2026 administration on, the exam is based on the 2021 International Building Code, the 2021 International Residential Code, the 2021 International Plumbing Code and ICC A117.1-2017 (CIDQ Exam Reference Materials).
- Practice finding and applying the right provision. The code text is available during the exam, but you still need to recognize which rule and condition apply rather than relying on a remembered dimension.
- Expect text, not figures. CIDQ says the examination code document includes no images. The public Building Codes reference list is a table of contents, not that complete code text.
- Know which chapter answers which question. IBC Chapter 3 covers occupancy groups, Chapter 5 heights and areas, Chapter 7 fire and smoke protection, Chapter 8 interior finishes, Chapter 10 means of egress, Chapter 11 accessibility scoping and Chapter 12 interior environment. In A117.1, Chapter 3 covers building blocks such as turning space and reach ranges, Chapter 4 accessible routes and doors, Chapter 6 plumbing elements and Chapter 7 signs. IPC Chapter 4 covers fixtures (CIDQ Building Codes document).
- Know what the standards measure. CIDQ expects conceptual knowledge of when standards such as NFPA, ANSI, ASTM, ASHRAE, BIFMA and UL apply (CIDQ blueprint FAQs). Question 33 is a good self-check.
Quick answers about the IDFX
What's the IDFX pass rate? 53% for Spring 2026, 55% for Fall 2025 and 53% for Spring 2025 (CIDQ, NCIDQ Exam Pass Rates). CIDQ's table does not supply candidate counts or identify these as first-attempt-only rates. These administration-level percentages are not your probability of passing.
Can I take the IDFX as a student? Yes. Students in the final year of a bachelor's or master's interior design program can apply for the IDFX alone through Route 2, Part 1. After approval, that route gives you 4 exam administrations to pass (Candidate Handbook; CIDQ Eligibility).
What are the testing windows and Spring 2027 application dates? The IDFX runs April 1–30 and October 1–31. The handbook's standing spring application cutoff is January 31, with a weekend cutoff moving to the next business day at 11:59 p.m. ET. Applied to 2027, January 31 is a Sunday, so that rule yields Monday, February 1, 2027. The standing payment and scheduling period is January 3 to March 31. This is a calendar calculation from the published rule, not a separate 2027 announcement; check CIDQ's current handbook, Dates and Deadlines, p. 13 before applying.
Can I test from home? Yes, through Prometric's remote proctoring, if your computer and room pass its checks. Otherwise you test at a Prometric center (Candidate Handbook, pp. 15 and 19).
What happens if I take a break? The clock keeps running, and every question you've already viewed, including flagged or unanswered ones, becomes locked (Candidate Handbook). Finish your review of a block before you step away.
When do results come? Official score reports arrive about 6 to 8 weeks after the window closes, with a breakdown by content area. CIDQ says preliminary results will be released after the Fall 2026 administration (CIDQ, About the Exams).
If I fail, can I retake it? Yes, within your eligibility period. Each exam section may be attempted only once per administration; a failed attempt does not permit a second attempt in the same window (Candidate Handbook).
Next: CIDQ's own practice
- CIDQ's free IDFX practice questions: 10 official questions for another view of how CIDQ writes its items.
- CIDQ's Study Materials page: the official entry point for its Demo Exam, sample questions, current blueprint and code-reference list.
Sources and verification
Official exam facts
- CIDQ, About the Exams — NCIDQ Exam Pass Rates; Exam Scoring Overview; Official Exam Results.
- CIDQ, IDFX Exam Blueprint — pp. 1–2.
- CIDQ, NCIDQ Candidate Handbook — pp. 4, 7, 9, 11, 13, 15, 19, 23, 26, 30, 32–35.
- CIDQ, 2026 Exam Blueprint FAQs — Questions 4–11 and 15–20.
- CIDQ, Building Codes reference list — p. 1 introduction and pp. 1–9 chapter/section list.
- CIDQ, Exam Reference Materials — p. 1, code-reference paragraph.
Codes, accessibility and test methods
- ICC, 2021 IBC Means of Egress — Slides 19, 26, 30–32, 46–50, 57–58, 70–74, 79–81 and 88–90.
- South Adams County Fire District, Occupancy Classifications — pp. 1–2, Assembly A-2 and Business; Mercantile row.
- 2021 Seattle Building Code, Chapter 6: Types of Construction — §§602.2–602.3.
- ICC, 2017 ICC A117.1 Significant Changes — Slide 13, §304; slide 55, §808.
- U.S. Access Board, Guide to the ADA Standards: Signs — §§703.4 and 703.5.1: placement, baselines, clear floor space, finish and contrast.
- U.S. Access Board, Guide to the ADA Standards: Operable Parts — §308.2.2; Knee and Toe Space; Obstructed High Reach.
- U.S. Access Board, Guide to the ADA Standards: Protruding Objects — §307.2 Protrusion Limits; §307.4 Vertical Clearance.
- Intertek, ASTM E84: Surface Burning Characteristics — What are the flame-spread classifications?; test purpose.
- Intertek, ASTM E648: Critical Radiant Flux — Test method and critical radiant flux.
- Capital Testing, Flame Spread Testing Requirements for Flooring Products — Critical radiant flux and IBC Section 804 class discussion.
- NFPA 701, scope published through ANSI — Test Methods 1 and 2; interior-finish distinction.
- 40 CFR 61.145(a), asbestos inspection before demolition or renovation — §61.145(a).
Design, health and building science
- U.S. Department of Energy, Energy 101: Daylighting — North-, east- and west-facing window paragraphs.
- U.S. Department of Energy, LED Color Characteristics — p. 6, Color Rendering Index sidebar; color-temperature discussion.
- U.S. Department of Energy, Light-bulb color-temperature table — Table 3: Correlated Color Temperatures and Typical Applications.
- NIH, Sound Design Metrics — p. 1, STC and NRC explanations.
- OSHA, Computer Workstations: Monitors — Viewing distance; Viewing angle—height.
- EPA, Volatile Organic Compounds and Indoor Air Quality — Introduction; Sources of VOCs; Steps to Reduce Exposure.
- NC State, Center for Universal Design — Principles 1, 4, 5 and 6.
- Center for Health Design, EBD Overview (hosted copy) — p. 4, definition of evidence-based design.
- IWBI, WELL Certification — Holistic well-being, supported by evidence.
- U.S. Green Building Council, LEED — What is LEED?.
- ENERGY STAR, About — Program introduction.
- WBDG, Architectural Programming — Gather Relevant Information; Identify Strategies; Determine Quantitative Requirements.
- Vectorworks 2024 Help, Programming Studies — Adjacency matrix and bubble-diagram explanation.
Last verified: October 13, 2026: CIDQ's blueprint, handbook, scoring and results notices, reported pass rates, standing dates, delivery options and exam-reference editions; the linked teaching sources and calculations were also checked. These were source-based checks, not a review by an NCIDQ Certificate holder.
By the Castleport Test Prep Editorial Team.
Castleport Test Prep is an independent exam prep publisher. We're not affiliated with, endorsed by, or approved by the Council for Interior Design Qualification (CIDQ). NCIDQ, IDFX and other exam and credential names identify their subjects; trademarks belong to their respective owners. These questions are original and unofficial, and none is a real or recalled exam question. Practice results don't guarantee an exam score, certification or licensure.